Problem: Polycarp has just invented a new binary protocol for data transmission. He is encoding positive integer decimal number to binary string using following algorithm:

  * Each digit is represented with number of '1' characters equal to the value of that digit (for 0 it is zero ones). 
  * Digits are written one by one in order corresponding to number and separated by single '0' character. 



Though Polycarp learnt how to encode the numbers, he has no idea how to decode them back. Help him calculate the decoded number.

Input

The first line contains one integer number n (1 ≤ n ≤ 89) — length of the string s.

The second line contains string s — sequence of '0' and '1' characters, number in its encoded format. It is guaranteed that the number corresponding to the string is positive and doesn't exceed 109. The string always starts with '1'.

Output

Print the decoded number.

Examples

Input

3
111


Output

3


Input

9
110011101


Output

2031

Solution (in JAVA):

Solution:


import java.util.Scanner;

public class Polycarp {

	public static void main(String[] args) {
		Scanner reader = new Scanner(System.in);
		int n=reader.nextInt();
		String s=reader.next();
		int num=0;
		boolean flag=true;
		for (int i=0;i<s.length();i++) {
			if (s.charAt(i)=='1' || s.charAt(i)=='0')
				flag =true;
			else {
				flag =false;
			}	
		}
		if (flag==true) {
		//Check if the input length = actual length
		if (n!=s.length())
			System.out.println("The lenght doesn't match the stream length");
		//Check if the string starts with 1
		else if (s.charAt(0)=='0')
			System.out.println("This is Wrong Input The number must start with 1");
		//Check if the length of char is between 1&89
		else if (s.length()<=89 && s.length() >= 1 ) {
			    for (int i=0; i<s.length(); i++) {
			    	if(s.charAt(i)=='1') {
			    		num++;
			    	}else if(s.charAt(i)=='0') {
			    		System.out.print(num);
			    		num=0;
			    		}
			    	//Check for the last chat in string
			    	if ((i+1) == s.length()) {
			    			System.out.print(num);
			    		
			    	}
			    }
	}
	}else {
		System.out.println("You entered worng binary stream");
	}
	}
}